Electrical attachment plug



Sept 28 was;

` A. MARRA ELECTRICAL ATTACHMENT PLUG Filed Oct.. ll, 1924 lo for a yment plugs and has for its Aco-acting wedge 12.

Patented Sept. 28, 1926.-

UNITED STATES 1,601,255y Price.

ANTHONY MAREA., OF BROOKLYN, NEW YORK.

ELECTRICAL ATTACHMENT PLUG.

.Application led October 11, 1924. Serial No. 743,056.

This invention relates to electrical attachprimary object. the provision of a plug which may be removed from an electric socket by pulling -upon the electric cord leading to the plug,

without the fear of the conducting Wires pulling away from the terminals of the plug.

Another object is to provide an attachment plug in which the end of an electric -cord is inserted whereby the greater the pulling action upon the cord, the greater is the clamping action between the cord and the plug.

v A further object of the invention resides in anattachment-plug, capable of performing Athe above 'functions' which is simple in construction, lcheap of manufacture and easy .to assemble or disassemble. Y

l/Vith these and other objects in view, the" invention resides'in certain novel construction and combination and arrangement of parts, the essential features of which are hereinafter fully described, are particularly 'pointed out in the appended claims, andare f illustra-ted in the accompanying drawing,

Figure 1 is a vertical sectional view of my improved attachment plug.A

Figure 2 is a vertical transverse sectional View on theline 2 2 of Figure 1. Figure 3 is a bottom plan view.

Figurcfl is a detail perspective view of the wedge.

Figure 5 is a horizontal sectional viewthrough the wedge.

Referring more particularly to the drawing, the reference numeral 10l designates my improved plug in its entirety and which includes but two parts, namely a cap 11 and a The cap 11 is constructedV of relatively hard insulating material, and has its under- A slot 111 is formed ing .a kink in able insulating material 'such as rubber, the body of which is lbifurcated to provide spaced diverging jaws or legs 22 between which the electric cord clamped. The wedge is formed with a neck 23 havinga smooth bore 24 therein and ,Whichneck is of a more flexible quality than the body of the wedge. The neck extends through the opening 17 in the cap and is cord 2l. p In practice, the end of the electric cord is stripped to expose the leads or wires 20,

21 is adapted to be,`

after which the cord is inserted through the mouth of the wedge so that the wires extend a slight distance b'eyond the other end of the wedge. The neck of the wedge is now inserted through the until the neck 'projects from the cap, after which the. same. is given a pull to cause the. inclined walls of the slot to compress the jaws 22 about the electric cord 21, thus causthe cord by reason of the coact'ing corrugations. As the wedge is pulled through. the slot, the teeth on the wedge will co-act with the teeth on the walls 0f the slot and serve to lock the wedge against removal. The wires 20 are then connected with the screws 19 when the plug is ready for use. It will now be seen that any pulling upon the electric cord will tend lto set up a greater wedge action between the cap and the wedge and consequently between the jaws of the wedge and the electric cord.

When it is desired to disconnect the cord from the plug, the wires 2O are unfastened from their terminals and a sharp instrument inserted bet-Ween the cap and the wedge through the wide opening of the slot to compress one of the jaws 22 tovdisengage the c0- acting teeth. When the wedge is removed from the cap, the tendency of the jaws is to expand, thereby releasing the electric cord.

i While I have described what I deem to be the most desirable embodiment of my invention,y it is obvious that many of the details may be varied without in any way departing wide end of the slot 14 from the spirit of my invention, and I therefore do not limit myself to the exact details of construction herein set forth nor to anything less than the whole of my invention limited only by the appended cl aims. It will also be apparent that my invention may be used in various other capacities wherein it is desired to anchor the end of a flexible cable or rope.

What is claimed as new is f '1. An attachment-plug comprising a cap having a slot therein, a member having a bore for the passage of an electric cord, normally expanding jaws on said member, and co-acting means on said memberand cap for compressing said jaws about an electric cord upon the insertion of said member in the bore of said cap, and for locking said member and cap against separation, said coacting means including opposed teeth on the i end walls of said slot, and teeth on the exterior faces of said jaws for engagement with each other.

2. An attachment plug comprising a cap having va slot therein, the end walls of the slot tapering toward each other, a member having a bore therein for the passage of a flexible cable, jaws formed on said member ment with the iexible cable.

3. `A`n attachment plug comprising a cap Ihaving' a slot extending therethrough, the

opposed end walls of the slot tapering toward each other and being provided with teeth, a member having a bore therein and being bifurcated to provide yieldable legs, the bore communicating with the bifurcation for the passage of a flexible cable therethrough, the inner faces of said legs having co-acting corrugations formed thereon, and teeth formed on the exterior surface of said legs for coaction with the teeth on said cap for compressing said yieldable legs `toward each other to grip the cable and for locking said member with said cap.

In testimony whereof I have affixed my signature.

ANTHONY MARRA. 

